Lecture 4

Question 1

what is polygenic inheritance

Answer 1

it is the phenotype that is influenced by the genes.

Question 2

what is sexual selection?

Answer 2

it is a case of natural selection, where there is competition for mating opportunities that can increase mating success.

Question 3

what is the difference between intersexual and intrasexual selection?

Answer 3

intrasexual is competition within one sex for mating and intersexual is one sex choosing mates from the other sex for mating

Question 4

what is sexual dimorphism?

Answer 4

it is an adaptation that only benefits one sex, while it is harmful to the other sex.

Question 5

what is the heterozygote advantage

Answer 5

when one copy of an allele has a recessive locus

Question 6

what is frequency -dependent selection?

Answer 6

is when one allele is more favoured than another

Question 7

with sickle-cell anemia who has the stronger fitness?

Answer 7

Ss has a higher fitness than SS